S
M
T
W
T
F
S
29
50°
36°
30
53°
33°
31
61°
33°
1
49°
39°
2
56°
38°
3
59°
33°
4
68°
42°
5
73°
45°
6
72°
46°
7
60°
37°
8
59°
39°
9
60°
40°
10
64°
37°
11
66°
43°
12
66°
43°
13
61°
42°
14
60°
41°
15
56°
44°
16
61°
43°
17
64°
45°
18
62°
43°
19
56°
40°
20
55°
38°
21
55°
37°
22
56°
38°
23
56°
38°
24
57°
37°
25
58°
42°
26
58°
42°
27
57°
40°
28
61°
39°
29
62°
41°
30
65°
43°
1
65°
43°
2
67°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Onalaska
Onalaska's April 2026 forecast shows daily high temperatures ranging from 49° to 73°, with overnight lows between 33° and 46°. The average high for April is 61° with an average low of 41°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in Onalaska. See also: May | June | July.
